Don't retry requesting the last chunk

It is unnecessary to repeat the request of a log chunk after reaching a
final state. This is a follow up to fixing the live build log not to
stop in a not final state.

src/api/app/controllers/webui/package_controller.rb

@@ -467,8 +467,6 @@ def update_build_log
       end
 
       @log_chunk = get_log_chunk(@project, @package_name, @repo, @arch, chunk_start, chunk_end)
-      # retry the last chunk again, because build compare overwrites last log lines
-      @log_chunk = get_log_chunk(@project, @package_name, @repo, @arch, chunk_start, chunk_end) if @log_chunk.length.zero? && !@first_request && !@finished
 
       old_offset = @offset
       @offset = [chunk_end, @size].min